<div class="card">
  <div class="card-header">
    {{news.author}}
  </div>
  <div class="card-body">
    <h5 class="card-title">{{news.title}}</h5>
    <p class="card-text"  [innerHTML]="news.content | tohtml"></p>
    <a  class="btn btn-primary" (click)="goBack()">返回</a>
  </div>
</div>